beam diameter


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beam diameter

[′bēm dī‚am·əd·ər]
(optics)
The distance between points on opposite sides of a light beam at which the power per unit area drops to 1/ e (0.37) times its maximum value.
References in periodicals archive ?
Watkins recognized that creating a light for artwork that could be adjusted for light temperature, brightness and beam diameter was critical.
Boone and Crockett's scoring system can reveal if a particular buck is charging forward or stuck in neutral, but the beam diameter right above the burr reveals true health and genetic potential.
Power mode" is when the beam diameter is less than the defining aperture of the TSI instrument (or NIST irradiance standard); "irradiance mode" is when the input beam diameter is greater than the diameter of the defining aperture.
The maximum penetration depth (the electron range) depends upon a lot of factors: electron beam current, accelerating voltage, electron beam diameter, electron beam power, material density, etc.
They use the same control electronics and have the same beam diameter and divergence characteristics as the company's 85 YCA-series 561-nm lasers.
5 mrad; in other words, 10 m from the module, the beam diameter is within 3 x 2 mm.
Mean antler beam diameter of yearling males declined in the hill country, but no differences were apparent in the farmland region.
1992) analyzed effects of counting times, beam current, accelerating voltage, and beam diameter on measures of Sr and other elements and they warned that beam powers required for WD-EM were sufficient to cause specimen damage including pitting and chemical change.
The ablation process can use a near-infrared laser that delivers a beam diameter down to 5 microns or a uv laser that generates a much narrower beam--down to 355 nm.
Morphological data from these beams were used to determine the relative contributions of beam diameter and joint density (number of joints per millimeter of beam length) to the flexural and torsional stiffness of these two structures.
The basic transmitter weighs 4kg, with a 50mm beam diameter and is complete with an integral visible pointer, fast response capability and features continuous 4-20mA output, plus R232, together with two set-point alarm relays and open collectors.